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SV40 has served as a powerful tool for understanding fundamental viral and cellular processes; however, despite extensive study, the SV40 HR mutant phenotype remains poorly understood. Mutations in the C terminus of large T antigen that disrupt binding to the host protein FAM111A render SV40 HR viruses unable to replicate in restrictive cell types. Our work reveals a defect of HR mutant viruses in the formation of viral replication centers that can be rescued by depletion of FAM111A. Furthermore, inhibition of viral DNA replication reduces the effects of FAM111A restriction on viral gene expression. Additionally, FAM111A is a poorly characterized cellular protein whose mutation leads to two severe human syndromes, Kenny-Caffey syndrome and osteocraniostenosis. Our findings regarding the role of FAM111A in restricting viral replication and its localization to nucleoli and viral replication centers provide further insight into FAM111A function that could help reveal the underlying disease-associated mechanisms.

Contribution of DNA Replication to the FAM111A-Mediated Simian Virus 40 Host Range Phenotype